New here? Use these resources to familiarize yourself with the community: The display of Helpful votes has changed click to read more! - edited Validation can be enabled or disabled on a per-tunnel-group basis with the peer-id-validate command: The difference in ID selection/validation causes two separate interoperability issues: When cert auth is used on the ASA, the ASA tries to validate the peer ID from the Subject Alternative Name (SAN) on the received certificate. endpoint-dns-name is the DNS name of the endpoint of the tunnel interface. Need to understand what does cumulative and peak mean here? 04-17-2009 07:07 AM. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. WebThe following is sample output from the show vpn-sessiondb detail l2l command, showing detailed information about LAN-to-LAN sessions: The command show vpn-sessiondb detail l2l provide details of vpn tunnel up time, Receiving and transfer Data Cisco-ASA# sh vpn-sessiondb l2l Session Type: LAN-to-LAN Connection : 212.25.140.19 Index : 17527 IP How to check IPSEC VPN is up or not via cisco asdm for particular client, Customers Also Viewed These Support Documents. This document can be used to verify the status of an IPSEC tunnel, validate tunnel monitoring, clear the tunnel, and restore the tunnel. Complete these steps in order to set up the site-to-site VPN tunnel via the ASDM wizard: Open the ASDM and navigate to Wizards > VPN Wizards > Site-to-site VPN Wizard: Click Next once you reach the wizard home page: Note: The most recent ASDM versions provide a link to a video that explains this configuration. You can use a ping in order to verify basic connectivity. Hope this helps. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Notice that in the access-list that is used in the route-map, the VPN traffic of interest should be denied. All rights reserved. However, there is a difference in the way routers and ASAs select their local identity. 04:48 AM Typically, this is the outside (or public) interface. However, I wanted to know what was the appropriate "Sh" commands i coud use to confirm the same. Set Up Tunnel Monitoring. If it is an initiator, the tunnel negotiation fails and PKI and IKEv2 debugs on the router show this: Use this section in order to confirm that your configuration works properly. The expected output is to see both the inbound and outbound Security Parameter Index (SPI). I would try the following commands to determine better the L2L VPN state/situation, You can naturally also use ASDM to check the Monitoring section and from there the VPN section. Certificate lookup based on the HTTP URL avoids the fragmentation that results when large certificates are transferred. How to check the status of the ipsec VPN tunnel? Find answers to your questions by entering keywords or phrases in the Search bar above. 04:12 PM. If a site-site VPN is not establishing successfully, you can debug it. And ASA-1 is verifying the operational of status of the Tunnel by New here? You might have to use a drop down menu in the actual VPN page to select Site to Site VPN / L2L VPN show you can list the L2L VPN connections possibly active on the ASA. In order to configurethe IKEv1 transform set, enter the crypto ipsec ikev1 transform-set command: A crypto map defines an IPSec policy to be negotiated in the IPSec SA and includes: You can then apply the crypto map to the interface: Here is the final configuration on the ASA: If the IOS router interfaces are not yet configured, then at least the LAN and WAN interfaces should be configured. Note:If there are multiple VPN tunnels on the ASA, it is recommended to use conditional debugs (debug crypto condition peer A.B.C.D), in order to limit the debug outputs to include only the specified peer. You might have to use a drop down menu in the actual VPN page to select Site to Site VPN / L2L VPN show you can list the L2L VPN connections possibly active on the ASA. All of the devices used in this document started with a cleared (default) configuration. ", Peak: Tells how many VPNs have been up at the most at the same time, Cumulative: Counts the total amount of connections that have been up on the device. This document can also be used with these hardware and software versions: Configuration of an IKEv2 tunnel between an ASA and a router with the use of pre-shared keys is straightforward. This command show run crypto mapis e use to see the crypto map list of existing Ipsec vpn tunnel. 01-07-2014 If software versions that do not have the fix for Cisco bug ID CSCul48246 are used on the ASA, then the HTTP-URL-based lookup is not negotiated on the ASA, and Cisco IOS software causes the authorization attempt to fail. Details 1. Establish a policy for the supported ISAKMP encryption, authentication Diffie-Hellman, lifetime, and key parameters. During IPSec Security Association (SA) negotiations, the peers must identify a transform set or proposal that is the same for both of the peers. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. Even if we dont configure certain parameters at initial configuration, Cisco ASA sets its default settings for dh group2, prf (sha) and SA lifetime (86400 seconds). Phase 2 = "show crypto ipsec sa". To see details for a particular tunnel, try: If a site-site VPN is not establishing successfully, you can debug it. show vpn-sessiondb detail l2l. ASA#show crypto isakmp sa detail | b [peer IP add] Check Phase 2 Tunnel. In order to verify whether IKEv1 Phase 2 is up on the ASA, enter the show crypto ipsec sa command. Ensure that the NAT (or noNAT) statement is not being masked by any other NAT statement. You can do a "show crypto ipsec sa detail" and a "show crypto isakmp sa detail" both of them will give you the remaining time of the configured lifetime. In this setup, PC1 in LAN-A wants to communicate with PC2 in LAN-B. If the tunnel does not comeup because of the size of the auth payload, the usual causes are: As of ASA version 9.0, the ASA supports a VPN in multi-context mode. It's usually useful to narrow down the debug output first with "debug crypto condition peer " and then turn on debugging level 7 for Ipsec and isakmp: debug cry isa 7 (debug crypto ikev1 or ikev2 on 8.4(1) or later). This section describes the commands that you can use on the ASA or IOS in order to verify the details for both Phases 1 and 2. Ex. The ASA debugs for tunnel negotiation are: The ASA debug for certificate authentication is: The router debugs for tunnel negotiation are: The router debugs for certificate authentication are: Edited the title. To confirm data is actually sent and received over the VPN, check the output of "show crypto ipsec sa" and confirm the counters for encaps|decaps are increasing. Find answers to your questions by entering keywords or phrases in the Search bar above. How to know Site to Site VPN up or Down st. Customers Also Viewed These Support Documents. All rights reserved. In order to configure the ISAKMP policies for the IKEv1 connections, enter the crypto isakmp policy command in global configuration mode. I configured the Cisco IPSec VPN from cisco gui in asa, however, i would like to know, how to check whether the vpn is up or not via gui for [particular customer. There is a global list of ISAKMP policies, each identified by sequence number. Customers Also Viewed These Support Documents. This command show crypto ipsec stats is use to Data Statistics of IPsec tunnels. I tried Monitoring-->VPN Statistics--> Session--->Filtered By---> IPSec Site-to-site. If this is not done, then the the tunnel only gets negotiated as long as the ASA is the responder. If IKEv2 debugs are enabled on the router, these debugs appear: For this issue, either configure the router in order to validate the fully qualified domain name (FQDN) or configure the ASA in order to use address as the ISAKMP ID. Here is an example: Note:You can configure multiple IKE policies on each peer that participates in IPSec. IKEv1: Tunnel ID : 3.1 UDP Src Port : 500 UDP Dst Port : 500 IKE Neg Mode : Main Auth Mode : preSharedKeys Encryption : AES256 Hashing : SHA1 Rekey Int (T): 86400 Seconds Rekey Left(T): 82325 Seconds D/H Group : 2 Filter Name : IPv6 Filter : IPsec: Tunnel ID : 3.2 Local Addr : 192.168.2.128/255.255.255.192/0/0 Remote Addr : 0.0.0.0/0.0.0.0/0/0 Encryption : AES256 Hashing : SHA1 Encapsulation: Tunnel Rekey Int (T): 28800 Seconds Rekey Left(T): 24725 Seconds Rekey Int (D): 4608000 K-Bytes Rekey Left(D): 4607701 K-Bytes Idle Time Out: 30 Minutes Idle TO Left : 29 Minutes Bytes Tx : 71301 Bytes Rx : 306744 Pkts Tx : 1066 Pkts Rx : 3654. and try other forms of the connection with "show vpn-sessiondb ?" Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. Use the sysopt connection permit-ipsec command in IPsec configurations on the PIX in order to permit IPsec traffic to pass through the PIX Firewall without a check of conduit or access-list command statements.. By default, any inbound session must be explicitly permitted by a conduit or access-list command All of the devices used in this document started with a cleared (default) configuration. if the tunnel is passing traffic the tunnel stays active and working? This document can be used to verify the status of an IPSEC tunnel, validate tunnel monitoring, clear the tunnel, and restore the tunnel. If the lifetimes are not identical, then the ASA uses a shorter lifetime. BGP Attributes Path Selection algorithm -BGP Attributes influence inbound and outbound traffic policy. Find answers to your questions by entering keywords or phrases in the Search bar above. 03-11-2019 However, when you use certificate authentication, there are certain caveats to keep in mind. PAN-OS Administrators Guide. In order to go to internet both of the above networks have L2L tunnel from their ASA 5505 to ASA 5520. ASA-1 and ASA-2 are establishing IPSCE Tunnel. I used the following "show" commands, "show crypto isakmp sa" and "sh crypto ipsec sa" and below are their outputs: dst src state conn-id slot, 30.0.0.1 20.0.0.1 QM_IDLE 2 0, Crypto map tag: branch-map, local addr. Download PDF. If peer ID validation is enabled and if IKEv2 platform debugs are enabled on the ASA, these debugs appear: For this issue, either the IP address of the certificate needs to be included in the peercertificate, or peer ID validation needs to be disabled on the ASA. show crypto ipsec client ezvpn should show a state of IPSEC ACTIVE; If the VPN tunnel is not up, issue a ping to AD1 sourced from VLAN 10. Two Sites (Site1 and Site-2) can communicate with each other by using ASA as gateway through a common Internet Service Provider Router (ISP_RTR7200). Is there any other command that I am missing??". In order to specify an extended access list for a crypto map entry, enter the. sh crypto ipsec sa peer 10.31.2.30peer address: 10.31.2.30 Crypto map tag: COMMC_Traffic_Crypto, seq num: 1, local addr: 10.31.2.19, access-list XC_Traffic extended permit ip 192.168.2.128 255.255.255.192 any local ident (addr/mask/prot/port): (192.168.2.128/255.255.255.192/0/0) remote ident (addr/mask/prot/port): (0.0.0.0/0.0.0.0/0/0) current_peer: 10.31.2.30, #pkts encaps: 1066, #pkts encrypt: 1066, #pkts digest: 1066 #pkts decaps: 3611, #pkts decrypt: 3611, #pkts verify: 3611 #pkts compressed: 0, #pkts decompressed: 0 #pkts not compressed: 1066, #pkts comp failed: 0, #pkts decomp failed: 0 #pre-frag successes: 0, #pre-frag failures: 0, #fragments created: 0 #PMTUs sent: 0, #PMTUs rcvd: 0, #decapsulated frgs needing reassembly: 0 #TFC rcvd: 0, #TFC sent: 0 #Valid ICMP Errors rcvd: 0, #Invalid ICMP Errors rcvd: 0 #send errors: 0, #recv errors: 0, local crypto endpt. So seems to me that your VPN is up and working. Complete these steps in order to set up the site-to-site VPN tunnel via the ASDM wizard: Open the ASDM and navigate to Wizards > VPN Wizards > Site-to-site VPN Wizard: Click Next once you reach the wizard home page: Note: The most recent ASDM versions provide a link to a video that explains this configuration. 05:44 PM. Find answers to your questions by entering keywords or phrases in the Search bar above. The tool is designed so that it accepts a show tech or show running-config command from either an ASA or IOS router. Refer to the Certificate to ISAKMP Profile Mapping section of the Internet Key Exchange for IPsec VPNs Configuration Guide, Cisco IOS XE Release 3S Cisco document for information about how to set this up. 03-12-2019 If the traffic passes through the tunnel, you should see the encaps/decaps counters increment. Next up we will look at debugging and troubleshooting IPSec VPNs. In other words, have you configure the other ASA to tunnel all traffic through the L2L VPN? If this is not done, then the the tunnel only gets negotiated as long as the ASA is the responder. One way is to display it with the specific peer ip. Certicates canbe revoked for a number of reasons such as: The mechanism used for certicate revocation depends on the CA. Learn more about how Cisco is using Inclusive Language. In order for the crypto map entry to be complete, there are some aspects that must be defined at a minimum: The final step is to apply the previously defined crypto map set to an interface. Connection : 150.1.13.3Index : 3 IP Addr : 150.1.13.3Protocol : IKEv1 IPsecEncryption : 3DES Hashing : MD5Bytes Tx : 69400 Bytes Rx : 69400Login Time : 13:17:08 UTC Thu Dec 22 2016Duration : 0h:04m:29s. New here? For the scope of this post Router (Site1_RTR7200) is not used. I suppose that when I type the commandsh cry sess remote , detailed "uptime" means that the tunnel is established that period of time and there were no downs. Ensure that the NAT (or noNAT) statement is not being masked by any other NAT statement. The tool is designed so that it accepts a show tech or show running-config command from either an ASA or IOS router. will show the status of the tunnels ( command reference ). Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. The following examples shows the username William and index number 2031. This is not a bug, but is expected behavior.The difference between IKEv1 and IKEv2 is that, in IKEv2, the Child SAs are created as part of the AUTH exchange itself. The router does this by default. Note:On the ASA, the packet-tracer tool that matches the traffic of interest can be used in order to initiate the IPSec tunnel (such aspacket-tracer input inside tcp 192.168.1.100 12345 192.168.2.200 80 detailedfor example). Both output wouldnt show anything if there was any active L2L VPN connections so the VPN listed by the second command is up. WebTo configure the IPSec VPN tunnel on Cisco ASA 55xx firewall running version 9.6: 1. 06:02 PM. Refer to Most Common IPsec L2L and Remote Access IPsec VPN Troubleshooting Solutions for information on the most common solutions to IPsec VPN problems. How can i check this on the 5520 ASA ? Find answers to your questions by entering keywords or phrases in the Search bar above. Regards, Nitin New here? In order to exempt that traffic, you must create an identity NAT rule. Could you please list down the commands to verify the status and in-depth details of each command output ?. In order to automatically verify whether the IPSec LAN-to-LAN configuration between the ASA and IOS is valid, you can use the IPSec LAN-to-LAN Checker tool. Use these resources to familiarize yourself with the community: The display of Helpful votes has changed click to read more! Note:Refer to the Important Information on Debug Commands and IP Security Troubleshooting - Understanding and Using debug Commands Cisco documents before you use debug commands. Can you please help me to understand this? New here? If there are multiple VPN tunnels on the ASA, it is recommended to use conditional debugs (. show vpn-sessiondb license-summary. I configured the Cisco IPSec VPN from cisco gui in asa, however, i would like to know, how to check whether the vpn is up or not via gui for [particular customer. This document describes common Cisco ASA commands used to troubleshoot IPsec issue. The expected output is to see both the inbound and outbound Security Parameter Index (SPI). Well, aside from traffic passing successfully through the new tunnels, the command: will show the status of the tunnels (command reference). show vpn-sessiondb l2l. Where the log messages eventually end up depends on how syslog is configured on your system. You can use a ping in order to verify basic connectivity. show vpn-sessiondb l2l. It also lists the packet counters which in your situation seem to indicate traffic is flowing in both directions. Note: An ACL for VPN traffic must be mirrored on both of the VPN peers. ** Found in IKE phase I aggressive mode. In order to verify whether IKEv1 Phase 1 is up on the ASA, enter the show crypto isakmp sa command. 08:26 PM, I have new setup where 2 different networks. If a site-site VPN is not establishing successfully, you can debug it. To see details for a particular tunnel, try: show vpn-sessiondb l2l. Note: On the router, a certificate map that is attached to the IKEv2 profile mustbe configured in order to recognize the DN. The second output also lists samekind of information but also some additional information that the other command doesnt list. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. If the traffic passes through the tunnel, you should see the encaps/decaps counters increment. Details 1. Use the sysopt connection permit-ipsec command in IPsec configurations on the PIX in order to permit IPsec traffic to pass through the PIX Firewall without a check of conduit or access-list command statements.. By default, any inbound session must be explicitly permitted by a conduit or access-list command This command show crypto isakmp sa Command shows the Internet Security Association Management Protocol (ISAKMP) security associations (SAs) built between peers.AM_ACTIVE / MM_ACTIVE The ISAKMP negotiations are complete. endpoint-dns-name is the DNS name of the endpoint of the tunnel interface. With IKEv1, you see a different behavior because Child SA creation happens during Quick Mode, and the CREATE_CHILD_SA message has the provision tocarry the Key Exchange payload, which specifies the DH parameters to derive the new shared secret. ASA 5505 has default gateway configured as ASA 5520. show vpn-sessiondb summary. Download PDF. A certificate revocation list (CRL) is a list of revoked certicates that have been issued and subsequently revoked by a given CA. 04:41 AM. access-list 101 permit ip 192.168.1.0 0.0.0.255 172.16.0.0 0.0.0.255. It depends if traffic is passing through the tunnel or not. The tool is designed so that it accepts a show tech or show running-config command from either an ASA or IOS router. When IKEv2 tunnels are used on routers, the local identity used in the negotiation is determined by the identity local command under the IKEv2 profile: By default, the router uses the address as the local identity. failed: 0, #pkts not decompressed: 0, #pkts decompress failed: 0, local crypto endpt. show vpn-sessiondb detail l2l. NetFlow IOS Configuration Using CLI ASA , Router , Switches and Nexus, SITE TO SITE IPSEC VPN PHASE-1 AND PHASE-2 TROUBLESHOOTING STEPS, Wireless dBm Value Table - Wi-Fi Signal Strength Analysis with dBm, Cisco ASA IPsec VPN Troubleshooting Command - VPN Up time, Crypto,Ipsec, vpn-sessiondb, Crypto map and AM_ACTIVE. On the other side, when the lifetime of the SA is over, the tunnel goes down? Tip: Refer to the Most Common L2L and Remote Access IPSec VPN Troubleshooting Solutions Cisco document for more information about how to troubleshoot a site-to-site VPN. Can you please help me to understand this? When i do sh crypto isakmp sa on 5505 it shows peer tunnel IP but state is MM_ACTIVE. All the formings could be from this same L2L VPN connection. Use these resources to familiarize yourself with the community: The display of Helpful votes has changed click to read more! View with Adobe Reader on a variety of devices, View in various apps on iPhone, iPad, Android, Sony Reader, or Windows Phone, View on Kindle device or Kindle app on multiple devices, Resource Allocation in Multi-Context Mode on ASA, Validation of the Certificate Revocation List, Network Time Protocol: Best Practices White Paper, CLI Book 1: Cisco ASA Series General Operations CLI Configuration Guide, 9.8, Public Key Infrastructure Configuration Guide, Cisco IOS XE Release 3S, Certificates and Public Key Infrastructure (PKI), Cisco ASA 5506 Adaptive Security Appliance that runs software version 9.8.4, Cisco 2900 Series Integrated Services Router (ISR) that runs Cisco IOS software version 15.3(3)M1, Cisco ASA that runs software version 8.4(1) orlater, Cisco ISR Generation 2 (G2) that runs Cisco IOS software version 15.2(4)M or later, Cisco ASR 1000 Series Aggregation Services Routers that run Cisco IOS-XE software version 15.2(4)S or later, Cisco Connected Grid Routers that run software version 15.2(4)M or later. Details on that command usage are here. 02-21-2020 Phase 2 Verification. Use the sysopt connection permit-ipsec command in IPsec configurations on the PIX in order to permit IPsec traffic to pass through the PIX Firewall without a check of conduit or access-list command statements.. By default, any inbound session must be explicitly permitted by a conduit or access-list command Connection : 10.x.x.x.Index : 3 IP Addr : 10..x.x.xProtocol : IKE IPsecEncryption : AES256 Hashing : SHA1Bytes Tx : 3902114912 Bytes Rx : 4164563005Login Time : 21:10:24 UTC Sun Dec 16 2012Duration : 22d 18h:55m:43s. Cert Distinguished Name for certificate authentication. will show the status of the tunnels ( command reference ). If the ASA is configured with a certificate that has Intermediate CAs and its peer doesnot have the same Intermediate CA, then the ASA needs to be explicitly configured to send the complete certificate chain to the router. Common places are, IKEv1/IKEv2 Between Cisco IOS and strongSwan Configuration Example, Configure a Site-to-Site IPSec IKEv1 Tunnel Between an ASA and a Cisco IOS Router. In order to specify the transform sets that can be used with the crypto map entry, enter the, The traffic that should be protected must be defined. If a site-site VPN is not establishing successfully, you can debug it. 01:20 PM In order to troubleshoot IPSec IKEv1 tunnel negotiation on an ASA firewall, you can use these debug commands: Note: If the number of VPN tunnels on the ASA is significant, thedebug crypto condition peer A.B.C.D command should be used before you enable the debugs in order to limit the debug outputs to include only the specified peer. Complete these steps in order to set up the site-to-site VPN tunnel via the ASDM wizard: Open the ASDM and navigate to Wizards > VPN Wizards > Site-to-site VPN Wizard: Click Next once you reach the wizard home page: Note: The most recent ASDM versions provide a link to a video that explains this configuration. Note: Refer to Important Information on Debug Commands before you use debug commands. To permit any packets that come from an IPsec tunnel without checking ACLs for the source and destination interfaces, enter the sysopt connection permit-vpn command in global configuration mode. Note:An ACL for VPN traffic uses the source and destination IP addresses after Network Address Translation (NAT). The DH Group configured under the crypto map is used only during a rekey. I will use the above commands and will update you. Configure IKE. VPNs. VPNs. Check Phase 1 Tunnel. Down The VPN tunnel is down. and try other forms of the connection with "show vpn-sessiondb ?" BGP Attributes - Path Selection algorithm -BGP Attributes influence inbound and outbound traffic policy. : 10.31.2.30/0 path mtu 1500, ipsec overhead 74(44), media mtu 1500 PMTU time remaining (sec): 0, DF policy: copy-df ICMP error validation: disabled, TFC packets: disabled current outbound spi: 06DFBB67 current inbound spi : 09900545, inbound esp sas: spi: 0x09900545 (160433477) transform: esp-aes-256 esp-sha-hmac no compression in use settings ={L2L, Tunnel, IKEv1, } slot: 0, conn_id: 12288, crypto-map: COMMC_Traffic_Crypto sa timing: remaining key lifetime (kB/sec): (3914702/24743) IV size: 16 bytes replay detection support: Y Anti replay bitmap: 0xFFFFFFFF 0xFFFFFFFF outbound esp sas: spi: 0x06DFBB67 (115325799) transform: esp-aes-256 esp-sha-hmac no compression in use settings ={L2L, Tunnel, IKEv1, } slot: 0, conn_id: 12288, crypto-map: COMMC_Traffic_Crypto sa timing: remaining key lifetime (kB/sec): (3914930/24743) IV size: 16 bytes replay detection support: Y Anti replay bitmap: 0x00000000 0x00000001, Connection : 10.31.2.30Index : 3 IP Addr : 10.31.2.30Protocol : IKEv1 IPsecEncryption : IKEv1: (1)AES256 IPsec: (1)AES256Hashing : IKEv1: (1)SHA1 IPsec: (1)SHA1Bytes Tx : 71301 Bytes Rx : 305820Login Time : 11:59:24 UTC Tue Jan 7 2014Duration : 1h:07m:54sIKEv1 Tunnels: 1IPsec Tunnels: 1. show crypto ipsec sa detailshow crypto ipsec sa. The information in this document uses this network setup: If the ASA interfaces are not configured, ensure that you configure at least the IP addresses, interface names, and security-levels: Note: Ensure that there is connectivity to both the internal and external networks, and especially to the remote peer that will be used in order to establish a site-to-site VPN tunnel. Can you please help me to understand this? At both of the above networks PC connected to switch gets IP from ASA 5505. An ACL for VPN traffic uses the source and destination IP addresses after Network Address Translation (NAT). And ASA-1 is verifying the operational of status of the Tunnel by Two Sites (Site1 and Site-2) can communicate with each other by using ASA as gateway through a common Internet Service Provider Router (ISP_RTR7200). Could you please list down the commands to verify the status and in-depth details of each command output ?.